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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 30 |
| 6 | 95 |
| 7 | 301 |
| 8 | 1009 |
| 9 | 3456 |
| 10 | 12224 |
| 11 | 44125 |
| 12 | 162233 |
| 13 | 605635 |
| 14 | 2292782 |
| 15 | 8784156 |
| 16 | 34020119 |
| 17 | 132973231 |
| 18 | 524230617 |
| 19 | 2082337971 |
| 20 | 8329063745 |
| 21 | 33523745895 |
| 22 | 135704089247 |
| 23 | 552226170127 |
| 24 | 2258059087302 |
| 25 | 9274549193981 |
| 26 | 38251031428465 |
| 27 | 158365187672308 |
| 28 | 658005514127674 |
| 29 | 2743136216360006 |
[1,1,2,4,11,30,95,301,1009,3456,12224,44125, 162233,605635,2292782,8784156,34020119,132973231, 524230617,2082337971,8329063745,33523745895, 135704089247,552226170127,2258059087302, 9274549193981,38251031428465,158365187672308, 658005514127674,2743136216360006] |